Smithsonian Report, 1920— Garner and Allard. 



Plate 1 7. 



Phascolus lunatus L. These plants received the same treatment as those in plate 16, except that alter 

 having been transferred to the greenhouse they were daily exposed to electric light from sunset till 

 midnight, in addition to the sunlight of the day. The plants grew rapidly, but were prevented 

 from flowering and fruiting by the artificially lengthened daylight period. 



